James Bottomley
dde2020754
libata: eliminate the home grown dma padding in favour of ...
that provided by the block layer
ATA requires that all DMA transfers begin and end on word boundaries.
Because of this, a large amount of machinery grew up in ide to adjust
scatterlists on this basis. However, as of 2.5, the block layer has a
dma_alignment variable which ensures both the beginning and length of a
DMA transfer are aligned on the dma_alignment boundary. Although the
block layer does adjust the beginning of the transfer to ensure this
happens, it doesn't actually adjust the length, it merely makes sure
that space is allocated for transfers beyond the declared length. The
upshot of this is that scatterlists may be padded to any size between
the actual length and the length adjusted to the dma_alignment safely
knowing that memory is allocated in this region.
Right at the moment, SCSI takes the default dma_aligment which is on a
512 byte boundary. Note that this aligment only applies to transfers
coming in from user space. However, since all kernel allocations are
automatically aligned on a minimum of 32 byte boundaries, it is safe to
adjust them in this manner as well.
tj: * Adjusting sg after padding is done in block layer. Make libata
set queue alignment correctly for ATAPI devices and drop broken
sg mangling from ata_sg_setup().
* Use request->raw_data_len for ATAPI transfer chunk size.
* Killed qc->raw_nbytes.
* Separated out killing qc->n_iter.
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-02-19 11:36:56 +01:00
acorn /char
Merge branches 'release', 'dmi', 'idle' and 'misc' into release
2008-02-14 02:44:28 -05:00
libata: eliminate the home grown dma padding in favour of
2008-02-19 11:36:56 +01:00
Driver core: Revert "Fix Firmware class name collision"
2008-02-07 11:31:46 -08:00
Fix compile of swim3 as module
2008-02-14 20:58:04 -08:00
hci_ldisc: fix null pointer deref
2008-02-12 17:54:16 -08:00
Merge branch 'for-2.6.25' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc
2008-02-07 09:02:26 -08:00
[POWERPC] hvc_rtas_init() must be __init
2008-02-14 22:11:02 +11:00
[CPUFREQ] fix configuration help message
2008-02-06 22:57:58 -05:00
ACPI, cpuidle: Clarify C-state description in sysfs
2008-02-14 00:09:55 -05:00
[HIFN]: Fix invalid config ifdefs for RNG support
2008-02-15 19:15:05 +08:00
DCA: convert struct class_device to struct device.
2008-02-08 15:33:33 -08:00
dio: ARRAY_SIZE() cleanup
2008-02-05 09:44:23 -08:00
async_tx: replace 'int_en' with operation preparation flags
2008-02-06 10:12:18 -07:00
drivers/edac/i3000: document type promotion
2008-02-07 08:42:23 -08:00
firewire: fw-sbp2: Use sbp2 device-provided mgt orb timeout for logins
2008-01-30 22:22:29 +01:00
SMBIOS/DMI: add type 41 = Onboard Devices Extended Information
2008-02-08 09:22:37 -08:00
gpio: handle pca953{4,5,6,7,8} too
2008-02-06 10:41:15 -08:00
HID: add USB IDs for MacBook 3rd generation
2008-02-13 17:08:04 +01:00
hwmon: (lm80) Add individual alarm files
2008-02-07 20:39:45 -05:00
hwmon: Discard useless I2C driver IDs
2008-02-07 20:39:44 -05:00
ide-cd: fix missing residual count setting in DMA mode
2008-02-19 01:41:26 +01:00
ieee1394: sbp2: fix bogus s/g access change
2008-02-02 13:48:16 +01:00
RDMA/nes: Fix possible array overrun
2008-02-18 10:33:59 -08:00
mn10300: add the MN10300/AM33 architecture to the kernel
2008-02-08 09:22:30 -08:00
isdn: fix section mismatch warning for ISACVer
2008-02-09 23:29:28 -08:00
PWM LED driver
2008-02-08 09:22:38 -08:00
lguest: accept guest _PAGE_PWT page table entries
2008-02-09 23:24:09 +01:00
Fix compile of swim3 as module
2008-02-14 20:58:04 -08:00
d_path: Make d_path() use a struct path
2008-02-14 21:17:09 -08:00
V4L/DVB (7219): zoran: Fix namespace conflicts with Zoran 'GPIO_MAX' enum
2008-02-18 12:18:28 -03:00
drivers/memstick/host/tifm_ms.c breakage
2008-02-13 08:16:35 -08:00
[SCSI] mpt fusion: Request I/O resources only when required
2008-02-11 10:20:54 -06:00
ASIC3 driver
2008-02-07 08:42:23 -08:00
thinkpad_acpi: static
2008-02-14 01:01:28 -05:00
mmc: extend ricoh_mmc to support Ricoh RL5c476
2008-02-08 09:02:47 +01:00
Introduce path_put()
2008-02-14 21:13:33 -08:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
2008-02-15 07:33:07 -08:00
nubus: kill drivers/nubus/nubus_syms.c
2008-02-05 09:44:23 -08:00
[POWERPC] Create and hook up of_platform_device_shutdown
2008-02-06 16:29:59 +11:00
d_path: Make get_dcookie() use a struct path argument
2008-02-14 21:17:08 -08:00
iommu sg merging: parisc: make iommu respect the segment size limits
2008-02-05 09:44:10 -08:00
parport: section fixup
2008-02-13 16:21:19 -08:00
mn10300: add the MN10300/AM33 architecture to the kernel
2008-02-08 09:22:30 -08:00
ide: introduce HAVE_IDE
2008-02-09 10:46:40 +01:00
Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6
2008-02-14 21:29:46 -08:00
Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6
2008-02-07 09:45:58 -08:00
[POWERPC] PS3: Update sys-manager button events
2008-02-14 22:11:01 +11:00
Merge branch 'linux-2.6'
2008-01-31 11:25:51 +11:00
rtc-r9701.c: silence compiler warning
2008-02-09 23:27:01 -08:00
claw/lcs/netiucv: check s390dbf level before sprints
2008-02-11 11:14:50 -05:00
libata: eliminate the home grown dma padding in favour of
2008-02-19 11:36:56 +01:00
serial: sh-sci: Fix up SH-5 build.
2008-02-14 14:22:12 +09:00
maple: improve detection of attached peripherals
2008-02-14 14:22:11 +09:00
spi: remove more dev->power.power_state usage
2008-02-06 10:41:11 -08:00
drivers/ssb/: Spelling fixes
2008-02-03 17:30:25 +02:00
ACPI: thermal: syntax, spelling, kernel-doc
2008-02-07 23:48:04 -05:00
uio: nopage
2008-02-06 10:41:07 -08:00
d_path: Make d_path() use a struct path
2008-02-14 21:17:09 -08:00
mn10300: add the MN10300/AM33 architecture to the kernel
2008-02-08 09:22:30 -08:00
virtio: add missing #include <linux/delay.h>
2008-02-06 10:41:21 -08:00
DS1WM: decouple host IRQ and INTR active state settings
2008-02-07 08:42:06 -08:00
drivers/watchdog/: Spelling fixes
2008-02-03 17:32:52 +02:00
memstick: initial commit for Sony MemoryStick support
2008-02-09 11:08:34 -08:00
memstick: initial commit for Sony MemoryStick support
2008-02-09 11:08:34 -08:00
dde2020754